15" 1.5GHz PowerBook -- noise after sleep?

Hey everyone. I got a brand new 15" PowerBook G4 with 80GB 5400RPM drive. It's a wonderful machine, but there's one thing that seems a bit unsettling to me, but maybe it's normal and I'd like to hear from everyone else with the same machine.

When I put the machine to sleep, I continue to hear a very, very faint high-pitched buzzing noise from the right-side of the machine. I believe this is where the hard drive is. Does everyone else hear this? The noise is almost inaudible from a couple feet away, but is pretty clear when I put my ear near the keyboard on that side.

Thanks for any insight any of you can provide!

iShater said:

Does it sound like the noise you hear from the power supply brick?

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My power supply brick appears to be completely silent.

I'm thinking it might be the hard drive because I also have 3.5" Maxtor hard drive that makes a slight whining noise while asleep, but I always considered that to be abnormal too.